Step stool



FIG. 1 is a front and top perspective view of a step stool, showing my new design;

FIG. 2 is a rear and bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view of step stool in use state.

The broken lines in the figures illustrate portions of the step stool that form no part of the claimed design. 

CLAIM The ornamental design for a step stool, as shown and described. 